The UK leaves the EU at 23:00 GMT on Friday, APA reports citing BBC.
Prime Minister Boris Johnson will publish a video message to hail the "dawn of a new era" at 22:00.
Labour leader Jeremy Corbyn urges the country not to "turn inwards" after it leaves the bloc.
A special cabinet meeting will be held in Sunderland - the first place to vote in favour of Brexit.
Scotland's First Minister Nicola Sturgeon says Brexit day is a "pivotal moment" for Scotland and the UK.
Supporters of the EU will hold a procession through Whitehall at 15:00 to "bid a fond farewell" to the union.
A celebration of Brexit will take place in Parliament Square from 21:00.
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